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April 21, 2014

Search: Calculate the molarity (M) of a solution of the strong base KOH if the pH is 12.5.

Number of results: 24,767

Chemistry
A volume of 150mL of 0.35M HCl is to be prepared from 80% HCl stock solution. (Density of HCl = 1.191g/mL). Calculate the molarity of 80% HCl stock solution.
Friday, August 9, 2013 at 1:37pm by K

Chem
I'm pretty sure this should be a fairly simple conversion factor problem, but I'm getting bad results. I want to go from molarity (mol/L) to density. Based on simply unit analysis, I figured that I could go in this direction: mol/L x g/mol x L/mL = g/mL With the appropriate ...
Thursday, March 22, 2007 at 4:38pm by Tasha

ChEMISTRY (Help please)
Calculate the mass percent of acetic acid in acetic acid solution. Average molarity= .8806753M Average density= 3.27463 Molar mass of acetic acid= 60.042g
Tuesday, April 13, 2010 at 8:02pm by Michelle

Chemistry
Kc = (CO)^2(O2)/(CO2)^2 Convert grams given to moles. moles = grams/molar mass. Convert to molarity from moles/5.0, then substitute into the Kc expression above and calculate Kc.
Sunday, February 27, 2011 at 11:52pm by DrBob222

Chemistry
You do not need the density to solve since the total volume is given Molarity=moles/liters 73.4g of KNO3/101.1032 g of KNO3/mol= moles of KNO3 Molarity=moles/liters=moles of KNO3/1.86L
Tuesday, January 29, 2013 at 5:46pm by Devron

Chem
I need to calcuted the molarity from this 12.5 g of ethylene glycol antifreeze dissolved in o.100kg of water. Density of solution is 1.0 g/mL I know molarity if mole of solute / L of solution. I am confused on how to find the L of solution. Do I add 12.5 and .100g to get the ...
Friday, February 15, 2013 at 4:12pm by Please please helppppp!!!!!

chemistry
Making the simplistic assumption that the dissolved NaCl(s) does not affect the volume of the solvent water, determine the constants m and b in the equation Molarity = m⋅density + b that relates the NaCl molarity to the NaCl(aq) density. Take the density of water to be 1...
Tuesday, May 28, 2013 at 2:49pm by Anonymous

AP CHEM
It was found that 39.9 mL of this diluted solution solution was needed to reach the stoichiometric point in a titration of 7 mL of a phosphoric acid solution according to the reaction 3KOH(aq) + H3PO4(aq) ! K3PO4(aq) + 3H2O(L) Calculate the molarity of the solution. Answer in ...
Thursday, September 26, 2013 at 8:58pm by Ankit

college Chemistry
assume 100 grams of the stuff. That means 10 gram peroxide: or moles=10/34 molarity=(10/34)/100g Now assuming the density is 1g/cm^3 (probably not correct), Molarity= 10/34)/.1=100/34=you do it.
Sunday, March 28, 2010 at 3:49pm by bobpursley

Chemsitry
When 3.75 g of a nonelectrolyte solute is dissolved in 405 mL of water at 25 C, the resulting solution exerts an osmotic pressure of 897 torr. What is molarity? I found molarity to be 0.048. What is the number of moles of solute? to find moles, I multiplied it by .405 and got...
Friday, March 1, 2013 at 11:08pm by Anonymous

Statistics for Business
Consider the following sample of data: 11.2, 28.4, 32.6, 17, 13.5, 2.2, 38, 41.4, 1.9, 14.4, 21.8, 23.8 a) Calculate the max, min, Q1, median, and Q3 b) Calculate the average c) Calculate the standard deviation d) Calculate the variance
Sunday, January 19, 2014 at 8:24pm by thomas

chemistry
Suppose 0.432g of zinc acetate is dissolved in 200.mL of a 16.0mM aqueous solution of ammonium sulfate. Calculate the final molarity of acetate anion in the solution. You can assume the volume of the solution doesn't change when the zinc acetate is dissolved in it.
Wednesday, January 18, 2012 at 6:30pm by Deborah

chemistry
Since October 2004, Jack Daniels Tennessee whisky, produced in Lynchburg, TN, has been bottled at 80 proof (40% alcohol by volume). Given that the density of ethyl alcohol is 0.789 g/cm3, and that of water 1.00 g/cm3, calculate the concentration of the alcohol in (a) percent ...
Tuesday, March 13, 2012 at 12:39pm by brandi

Chemistry
If I have to make a solution with sodium bicarbonate (baking soda) how do i find the molarity and how do i correctly make the solution??? i.e. how do i prepare a solution of sodium bicarbonate with a molarity of 0.01?
Tuesday, January 8, 2008 at 7:51pm by Jake

Chemistry please help
I can't find the answer of A 0.1052 g sample of copper metal is dissolved in 55 mL of concentrated HNO3 to form Cu2+ ions and then water is added to make a total volume of 208.5 mL. (Calculate the molarity of Cu2+.) I calculated 0.1052*63.546/6.022e23/0.2085 but webassign told...
Friday, June 21, 2013 at 2:31pm by Ashley

chemistry
Calculate the molarity and mole fraction of a 2.35 m solution of acetone (CH3COCH3) dissolved in ethanol (C2H5OH). (Density of acetone = 0.788 g/cm3; density of ethanol = 0.789 g/cm3.) Assume that the final volume equals the sum of the volumes of acetone and ethanol.
Tuesday, May 4, 2010 at 2:00pm by bob

chem
a.)How many moles of NaOH are required to prepare 2.00L od 0.380M solution? answer is 0.760 mole of NaOH (mole/l * 2.00L) b.)What will be the molarity of a solution if 3.50 g of KOH are dissolved in water to make 150.0 mL of solution? answer is 0.52 M KOH (gKOH/molar mass KOH=...
Friday, November 30, 2012 at 12:34am by Angel Locsin

chemistry
A solution contains 4.44% by mass of NaI in water. Calculate the molarity of the NaI, if the density of the solution is 1.2711 g mL-1. i got the answer to be 8.48 M... the percent mass is irrelevant information, right? i figured out the answer just by the given density alone.
Sunday, November 11, 2007 at 11:06am by keely

12th grade chemistry
Use the combined mass (250 g) and the density of the solution (which you were given) to compute the volume of the solution. Once you have the mass of perchloric acid and the total volume, molarity is easily computed. The formula for percholroic acid is HClO4. You will need ...
Sunday, October 24, 2010 at 3:17pm by drwls

Chemistry
I had conducted an experiment to figure out the percent by mass of baking soda in a mixture by titration. I had to standardize 1.0M HCl. Through the standardization process and the titration curve of the primary standard and the HCl, the molarity has to be found, but is this ...
Sunday, April 13, 2014 at 7:27pm by Sandy

Chemistry, pH, Buffers
Please help!! Given this data: mass of unknown acid 1.4671g Volume of NaOH used in titration 18.47mL Concentration of the NaOH used 0.2403M pH of the original acid solution 2.16 pH of the final acid solution 3.49 Show me how do I calculate the Ka of the unknown acid and the ...
Monday, April 2, 2012 at 11:44am by Krina

chem
Convert 3.57 g KMnO4 to moles. mols = grams/molar mass. Using the coefficients in the balanced equation, convert mols KMnO4 to mols Na2C2O4. molarity Na2C2O4 = mols/L. YOu know mols from the above calculation, you know M, calculate volume. Post your work if you get stuck.
Tuesday, April 7, 2009 at 5:25pm by DrBob222

physical science
Since October 2004, Jack Daniels Tennessee whisky, produced in Lynchburg, TN, has been bottled at 80 proof (40% alcohol by volume). Given that the density of ethyl alcohol is 0.789 g/cm3, and that of water 1.00 g/cm3, calculate the concentration of the alcohol in (a) percent ...
Tuesday, March 13, 2012 at 12:44pm by brandi

Chemisty
Use stoichiometry to back calculate from 5.3 g CaCl2 to see the moles HCl used (you could go the long way and calculate moles CaCO3 used then convert to HCl but that step isn't necessary). moles CaCl2 = grams/molar mass = 5.3/about 111 = about 0.048 (but you need to do it ...
Sunday, November 20, 2011 at 8:22pm by DrBob222

College Chemistry
We will calculate the amount of acid to use in each titration. Assume that you are using 0.0512 M NaOH(aq). A good volume of NaOH(aq) to use per titration is 15mL. From this molarity and volume, the moles of NaOH can be calculated. Since the unknown acid is monoprotic, this ...
Monday, October 15, 2012 at 5:34pm by Alex

chemistry
Calculate the molarity and mole fraction of acetone in a 1.29 m solution of acetone (CH3COCH3) in ethanol (C2H5OH). (Density of acetone = 0.788 g/cm3; density of ethanol = 0.789 g/cm3.) Assume that the volumes of acetone and ethanol add.
Thursday, January 20, 2011 at 8:51pm by sarah

Chem 112
Calculate the pH of a buffer solution prepared by dissolving 0.12 mole of cyanic acid, HCNO and 0.65 mole of sodium cyanate, NaCNO in enough water to make 1.0 liter of solution. [Ka(HCNO) = 2.0 10-4] I know that this question has something to do with turning moles into ...
Monday, March 21, 2011 at 1:48am by Bridget

Chem
It tells you it wants you to calculate the Ka for ASA. If we call it HA, then HA ==> H^+ + A^- Ka = (H^+)(A^-)/(HA) You know (H^+) and you have that right. (A^-) is the same as (H^+). I have used H^+ for H3O^+. For HA, you want to plug in the molarity of the aspirin which ...
Sunday, March 28, 2010 at 8:03pm by DrBob222

Chemistry
A buret (initial and final buret reading were 2.20 mL and 11.86 mL) was used to deliver a sample of 2.1E-5 M stock dye into a 25.0 mL volumetric flask. The dye was then diluted with water to exactly 25.0 mL. Calculate the molarity of the resulting solution.
Tuesday, October 26, 2010 at 4:37pm by Mallory

college
1) You are given solutions of HCl and NaOH and must determine their concentrations. You use 37.0mL of NaOH to titrate 100mL of HCl and 13.6 mL of NaOH to titrate 50.0mL of 0.0782 M H2SO4. Find the unknown concentrations. Molarity of NaOH and molarity of HCL? 2) Sodium ...
Monday, October 4, 2010 at 3:02pm by Ashley

Chemistry
1) You are given solutions of HCl and NaOH and must determine their concentrations. You use 37.0mL of NaOH to titrate 100mL of HCl and 13.6 mL of NaOH to titrate 50.0mL of 0.0782 M H2SO4. Find the unknown concentrations. Molarity of NaOH and molarity of HCL? 2) Sodium ...
Monday, October 4, 2010 at 3:02pm by Ashley

Chemistry
1) You are given solutions of HCl and NaOH and must determine their concentrations. You use 37.0mL of NaOH to titrate 100mL of HCl and 13.6 mL of NaOH to titrate 50.0mL of 0.0782 M H2SO4. Find the unknown concentrations. Molarity of NaOH and molarity of HCL? 2) Sodium ...
Monday, October 4, 2010 at 3:03pm by Ashley

College Chemistry
Amphetamine (C9H13N) is a weak base with a pKb of 4.2. Calculate the pH of a solution containing an amphetamine concentration of 215 mg/L. I calculated the molarity as 1.58*10^-3 and the Ka as 1.58*10^-10. I did ICE and i got the pH as 6.3, but it was wrong. Do you know what I...
Tuesday, March 23, 2010 at 6:22pm by Kyle

chemistry
No unit for the units cancel. mL/mL = 1/1. Yes, you need the ratio to calculate molarity; however, you can do that without doing the ratio first. One reason to do it now is that the second trial, third trial, etc. will give you a quick and dirty way to see how good your ...
Saturday, December 22, 2012 at 3:10pm by DrBob222

Chemistry
Just remember the definition of molarity. molarity = # mols/liter of solution. What do you want? 25 mL x 2.0 M = 0.025 L x 2.0 M = ??moles HCl. 12 M x ?liters = mols from above. Solve for liters. OR, you can do this all in one step. 12 M x mL = 25.0 mL x 2.0 M
Saturday, September 6, 2008 at 5:35pm by DrBob222

chemistry
I have this long online lab that I am working on and I am stuck on converting Molarity then ultimately finding the % of phosphoric acid in the cola? There is all of different steps I went through with information but I am going to try to give only the info needed to help me ...
Friday, July 3, 2009 at 3:10pm by Gweedo8

Chemistry
A solution is made by mixing 90.6 g of magnesium sulfate heptahydrate with 2320.0 g of water. 690.00 mL of the solution has a mass of 745.20 g. 1. What is the molarity of the magnesium sulfate solution? 2. What is the molarity of the magnesium ion? 3. What is the molality of ...
Wednesday, September 11, 2013 at 10:28pm by J

chemistry
Molarity = moles of solute/ Liter. 5g O2 * (1 mol O2/ 32 g O2)= x moles O2 convert 250 mL to Liters X moles O2/ Liters = molarity
Wednesday, December 12, 2012 at 7:44pm by Brad

Chemistry
If there are 8.0 mg of dissolved O2 per liter of H2O at 20 degrees C and 1 atm, calculate the number of moles of molecular O2 and the molarity of dissolved O2 per liter of H2O.
Sunday, August 28, 2011 at 9:04am by Jill

molarity
If it's 12 L of solution, the molarity is 3.4/12 = ??
Wednesday, December 10, 2008 at 11:51pm by DrBob222

Chemistry - urgent
What form of NaOH did you use? Assume granular. moles NaOH=3/40 moles HCl needed= 3/40=volume*Molarity so lets see what 7 ml will neutralize molarity=3/40/.007= or about 10Molar. 32Percent HCl is about 10M
Tuesday, September 21, 2010 at 10:03am by bobpursley

chemistry
Finding molarity and molality(best answer)? An aqueous solution is prepared by diluting 3.30 mL acetone,(d= 0.789g/mL) with water to a final volume of 75.0 mL. The density of the solution is 0.993 g/mL. What is the molarity, molality and mole fraction of acetone in this solution?
Friday, October 7, 2011 at 3:11am by sam

Chemistry
m = mols/kg solvent 1 kg solvent has a mass of 1,000 g and a volume of v = m/d = 1000/1.049 = 953.3 mL or 0.9533 liters. Then Molarity = mols/L. You have 0.688 mols and you have 0.9533 L so the molarity = ?? check my thinking.
Thursday, February 7, 2008 at 8:09pm by drbob222

Chemistry
Calculate the molarity of the concd HCl. 1.20 g/mL x 1000 mL x 0.37 x (1/36.5) = about 12 M or so but you do it exactly. Then mL x M = mL x M mL x 12 M = 2800 mL x 0.475 Solve for mL of the concd HCl solution.
Thursday, February 21, 2013 at 8:26pm by DrBob222

Chemistry
If 31.00 mL of a dilute solution of lime water (calcium hydroxide) required 10.10 mL of 0.246 M hydrochloric acid solution for neutralization to a methyl red end point, calculate the molarity of the lime water. Can you please explain how to do it? Do I use M1V1=M2V2?
Saturday, April 2, 2011 at 3:22pm by Lara

Chemistry
The measured potential of the following cell was 0.1776 volts: Pb|Pb2+(??M)||Pb2+(1.0M)|Pb Calculate the electrode potential of the unknown half-cell(anode). Not sure how to approach this, considering the molarity is unknown. There isn't a lot of space on the page for the ...
Thursday, March 27, 2014 at 12:26pm by Alex

Chemistry
I can't figure out how to solve this problem: The Ka for hydroflouric acid is 4.5 *10^-4 at 298K. Calculate the amount of sold NaF that is required to prepare a 250. mL acidic buffer with pH = 2.75. The initial molarity of hydroflouric acid is .250M but you have only 75mL. I ...
Thursday, April 7, 2011 at 12:39am by Jake

Chemistry
Molarity of NaOH solution = 0.06115 Volume of NaOH used = 15.50 mL Volume of unknown Sample = 10.00 mL Find the Moles of NaOH used? Find the molarity of H3PO4? Thanks!
Wednesday, October 10, 2012 at 8:18pm by Fred

Chemistry, #7
The pH of a 1.00 x 10^-3 M solution of pyrrolidine is 10.82. Calculate Kb. I know pyrrolidine is acidic because of the pH, and I know that tells me something about the Ka which in turn tells me something about the Kb. What does it tell me? Where should I begin this problem? Do...
Sunday, August 5, 2007 at 9:15pm by Taasha

more chemistry this time concentration
More pertinent info. Molarity = #mols/L of solution. That equation plus the ones I posted before will work both of these problems. Two problems I see, however, is that carbon tet is not soluble in water plus you don't list is you want molarity or molality. If you want molality...
Tuesday, January 1, 2008 at 2:05pm by DrBob222

chemistry
Write the equation and balance it. Determine mols of Ba(OH)2. M x L = mols. Use the equation to convert mols Ba(OH)2 to mols HCl. Then M x L = mols HCl. You know mols and you know molarity, calculate L and change to mL.
Monday, May 5, 2008 at 10:34pm by DrBob222

Chemistry!!!
Okay. I'll try to help. Molarity is concentration of a solution expressed as the following: #moles solute (or dissolved stuff)/1 L solution So a 1M solution would be a solution where in 1 liter, there is one mole of solute. But no. The molarity of a solution with 6 moles of ...
Saturday, May 1, 2010 at 2:13pm by anonymous

science
I am doing a titration lab and need help with a problem. (i used .100M H2SO4)(I used 10.0 ml of Ba(OH)2 solution and added 50.0 ml of distilled water making 60.0 ml total.) 1. Use the titration results to calculate the moles of H2SO4 that were used to reach the equivalence ...
Saturday, October 12, 2013 at 4:49pm by Charles

AP Chemistry
An aqueous sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution at 20C has a density of 1.3294 g/mL. Calculate (a) the molarity, (b) the molality, (c) the percent by mass, and (d) the mole fraction of H2SO4 for the solution. (MM H2SO4 = 98.08; MM H2O = 18....
Tuesday, January 5, 2010 at 10:24pm by Beth

Chemistry
7.0 ml of 6.0 M NaOH are diluted with water to a volume of 400 ml. You are asked to find the molarity of the resulting solution. The total number of moles of NaOH is not changed on dilution. Calulate the molarity. Work: (6)(.007)=(x)(.4) x=.105M Thanks for showing your work. I...
Thursday, April 19, 2007 at 8:29pm by Anonymous

Chemistry
Dr. Bob222 gave you the setup to calculate the grams of CaCl2. But I will go into a little bit more detail and maybe this will help: Molarity=Moles/Volume (L) The question tells you that you need need a total of 2L, but you don't know how many moles are in a 3.5M solution with...
Saturday, August 17, 2013 at 5:03pm by Devron

chemistry
you know moles of solute per 1kg solvent, that was given. Then, you need to find the volume of the solution with 1kg solvent. You do that by adding the mass of the solute, then dividing the mass by the density. That gives you the volume of solution. YOu can now calculate ...
Monday, October 20, 2008 at 3:30pm by bobpursley

Chemistry
The molarity of Sr2+ in a saturated solution of SrSO4 was determined to be 0.000500 M. Calculate the solubility product constant (Ksp) for SrSO4. SrSO4(s) = Sr^2+(aq) + SO4^2- (aq) Molar Mass (g/mol) SrSO4 183.68 This is what I know: Ksp = [Sr][SO4]
Wednesday, March 31, 2010 at 7:42am by Angel

Chemistry
Note the correct spelling of celsius. pi = MRT Solve for M = molarity. M = moles/L soln Use density to determine the volume of 100 g of the soln, then calculate moles. Finally, moles = grams/molar mass.You know g and moles, solve for molar mass.
Tuesday, February 15, 2011 at 10:52pm by DrBob222

Chemistry, Buffers, pH
Hi could someone please help me in the next 5 minutes with this question: Given this data: mass of unknown acid 1.4671g Volume of NaOH used in titration 18.47mL Concentration of the NaOH used 0.2403M pH of the original acid solution 2.16 pH of the final acid solution 3.49 Show...
Friday, September 26, 2008 at 1:30am by janet

Chemistry
I am trying to figure out how to calculate the reaction rate. In my question the reaction rate is: 1/2x molarity of sodium thiosulfate/reaction time Then I have to compare the rates of runs 1-3 and determine the orders of the reaction. Do I only find the reaction rate based ...
Monday, October 1, 2012 at 6:25pm by Zach

chemistry
Hmmm. You are given the Molarity of the stockroom solution. It is diluted by a factor of 20. Molarity=Mstockroom/20 Now, for the second part 4.6E-4=Mstockroom/dilution factor solve for dilution factor. Then, amount is equal to 100ml/dilution factor. There are other ways of ...
Monday, February 4, 2008 at 6:50am by bobpursley

Chemistry
You dissolve 5 g of calcium hydroxide in 2 liters of water. What is the molarity of the hydroxide ions in this solution? What is the molarity of the calcium ions in this solution?
Sunday, February 12, 2012 at 4:13pm by Amanda

Chemistry
a solution is made by combining 5 mL of .2M HC2H3O2, 5 mL of .2M NaC2H3O2, and 10 ml of water. calculate the molarity of HC2H3O2 and of NaC2H3O2 in this new solution
Monday, March 28, 2011 at 1:00pm by Anonymous

Chemistry
How will overshooting the end point of an acid-base titration by adding too much base to KHP affect the calculated molarity of the base? I would think you would need to add more KHP, then more base to bring it to the endpoint. So the molarity calculated should be the same. Is ...
Wednesday, December 5, 2012 at 3:17pm by T

chemistry
Suppose of copper (II) nitrate is dissolved in of a aqueous solution of sodium chromate. Calculate the final molarity of nitrate anion in the solution. You can assume the volume of the solution doesn't change when the copper (II) nitrate is dissolved in it. Round your answer ...
Tuesday, February 19, 2013 at 4:56pm by madison

chemistry
Find the g/mol for KBr 1.51g x 1mol/g/mol of KBr you should've gtt the answer for the mol the formula for molarity is M = mol/L plug the mol answer that you just found and divided by 2.05L Then you should;ve got the answer for molarity
Thursday, February 9, 2012 at 8:29pm by Misa

chemistry
Find the g/mol for KBr 1.51g x 1mol/g/mol of KBr you should've gtt the answer for the mol the formula for molarity is M = mol/L plug the mol answer that you just found and divided by 2.05L Then you should;ve got the answer for molarity
Thursday, February 9, 2012 at 8:29pm by Misa

Chemistry II
Acetone, C3H6O, is the main ingredient of nail polish remover. A solution is made up by adding 35.0mL of acetone(d=0.790g/mL) to 50.0mL of ethyl alcohol,C2H6O(d=0.798 g/mL). Assume that the volumes are additive. From this information calculate the molarity of acetone in the ...
Sunday, September 27, 2009 at 8:15pm by Mandy

Chemistry II
Acetone, C3H6O, is the main ingredient of nail polish remover. A solution is made up by adding 35.0mL of acetone(d=0.790g/mL) to 50.0mL of ethyl alcohol,C2H6O(d=0.798 g/mL). Assume that the volumes are additive. From this information calculate the molarity of acetone in the ...
Sunday, September 27, 2009 at 11:50pm by Mandy

chemistry
What is the pH of a buffer solution that is made by adding 21.0 grams of sodium fluoride to 1.00 Liter of 0.15M hydrofluoric acid? (see the Table above for the Ka of hydrofluoric acid; calculate the pH to 2 decimal places) hint: you will have to find the molarity of NaF in ...
Sunday, June 16, 2013 at 6:17pm by dennis

chemistry
What is the pH of a buffer solution that is made by adding 21.0 grams of sodium fluoride to 1.00 Liter of 0.15M hydrofluoric acid? (see the Table above for the Ka of hydrofluoric acid; calculate the pH to 2 decimal places) hint: you will have to find the molarity of NaF in ...
Sunday, June 16, 2013 at 6:17pm by Dennis

chemistry
What is the pH of a buffer solution that is made by adding 21.0 grams of sodium fluoride to 1.00 Liter of 0.15M hydrofluoric acid? (see the Table above for the Ka of hydrofluoric acid; calculate the pH to 2 decimal places) hint: you will have to find the molarity of NaF in ...
Sunday, June 16, 2013 at 9:41pm by Dennis

Chemistry
What is the pH of a buffer solution that is made by adding 21.0 grams of sodium fluoride to 1.00 Liter of 0.15M hydrofluoric acid? (see the Table above for the Ka of hydrofluoric acid; calculate the pH to 2 decimal places) hint: you will have to find the molarity of NaF in ...
Monday, June 17, 2013 at 10:36pm by D.J.

chemistry -IMPORTANT-
we have to make an instrctinal packet showin relationships between moles and concentration. i cant find the following 1)how is the number of moles dissolved in a set amount of solvent related to the molarity? 2)how to determine the amount of solvent in 100, 125, 200, and 375 ...
Thursday, February 12, 2009 at 12:26pm by lyne

Chemistry
If the solubility is 0.17 g/100 mL, that is equivalent to 1.7 g/1000 mL. And moles = grams/molar mass will give you the molarity. Use the equation given. You know pH, convert that to pOH, then to OH^-. Kb = (C17H21O4NHH^+)(OH^-)/(C17H21O4N). You know OH^- now, that is the same...
Sunday, August 9, 2009 at 8:15am by DrBob222

thermodynamics?
calculate the number of grams of glycerol, C3H5(OH)3 (MW=92.1 g/mol), that must be dissolved in 520 grams of water to raise the boiling point to 102.00 degrees Celsius. this whole chapter really lost me. delta T = Kb*molality delta T = 2 degrees. Kb = boiling point elevation ...
Saturday, April 21, 2007 at 4:15pm by chris

chemistry-Dr.Bob
About 0.1 g of the oxalate salt won't do it if you're looking for any kind of quantitative answer. And with buret readings to the second place, you must be looking for a decent answer. First balance the equation. Have you determined the molarity of the KMnO4? or is that the ...
Monday, May 5, 2008 at 5:53pm by DrBob222

analytical chemistry
first get for the moles of CaCO3 mols CaCO3= 0.5662g*(1mol CaCO3/100gCaCO3) Molarity of CaCO3= mols CaCO3/L of solution =0.005622mols/1L M EDTA= [(molarity CaCO3)(mL aliquot)]/ mL of EDTA M EDTA= [(0.005622)(25)]/21.88 = 0.00642 M
Sunday, February 3, 2013 at 8:26am by JFernando

chemistry
BaSO4 ==> Ba^+2 + SO4^-2 Ksp = (Ba^+2)(SO4^-2) = 1E-10 Plug in 0.002M for (Ba^+2) [from the BaCl2] and solve for sulfate ion. This assumes you are not to make a correction for the activity coefficients and work with straight molarity. Otherwise you must calculate the ...
Tuesday, December 21, 2010 at 4:09pm by DrBob222

Chemistry
You probably intended this to be potassium hydrogen phthalate which I will rewrite, to make things simpler, as KHP. The H is the hydrogen neutralized by the NaOH. NaOH + KHP ==> NaKP + H2O. mols KHP = 1.029 grams/molar mass KHP. mols NaOH = mols KHP. mols NaOH = L x M. You ...
Thursday, November 1, 2007 at 9:20pm by DrBob222

chem
how many ions do each produce when in a 1.0M solution CH3COOH Ca(NO3)2 NaNO3 NaCl H2SO4 To figure out this you have to be able to dissociate each one and multiply the amount of ions you get by the molarity. I believe NaCl would look like: Na+ + Cl- and because the molarity is ...
Sunday, April 22, 2007 at 9:01am by kim

Chemistry
Magnesium nitrate reacts with lithium sulfate in a double replacement reaction. You have 3.45 g of lithium sulfate and 275 mL of magnesium nitrate. Calculate the molarity of the Magnesium nitrate solution in the reaction.
Tuesday, February 21, 2012 at 8:09pm by Bella

Chemistry
Calculate amount of solid NaF required to prepare a 250mL acidic buffer with pH=2.75. The initial molarity of HF is .25M but you only have .075L of it. I have tried many different ways... the most recent and seems to be simplest was using H-H equaion and solving for the CB/CA ...
Wednesday, April 6, 2011 at 3:15am by John

urgent i need help within an hour!
Ascorbic acid (vitamin C, C6H8O6) is a water-soluble vitamin. A solution containing 83.3 g of ascorbic acid dissolved in 210. g of water has a density of 1.23 g/mL at 55C Calculate the molarity of ascorbic acid in this solution. i got 2.77 but its wrong
Monday, January 21, 2013 at 7:08am by Samantha

CHEMISTRY
Dr BOB can you explain this to me. I am so struggling with this subject. during a typical breathing cycle the CO2 concentration in the expired air rises to a peak of 4.6% by volume. Calculate the partial pressure of the CO2 at this point, assuming 1 bar of pressure. what is ...
Thursday, October 14, 2010 at 11:55pm by lulu78

Chemistry
The reaction describing the formation of ozone from oxygen is shown below. 3 O2(g) <--> 2 O3(g) Calculate Grxn at 288 K for this reaction in a flask where [O2] = 3.419 x 10-2 M and [O3] = 5.783 x 10-4 M. Assume G = 326 kJ. Use molarity to construct the reaction ...
Monday, January 2, 2012 at 4:47pm by Summer

chem
1. Determine if moles H+ or moles OH- is in excess 2. Determine ammount of excess. 3. Determine Molarity of excess ammount. 4. Solve for pH directly or by pOH id OH- is in excess I copied your original post above. I won't argue with you Christina for only you know what you ...
Monday, August 27, 2007 at 10:42pm by DrBob222

CHEMISTRY..please help..thanks
Calculate the new molarity if each of the following dilutions is made. Assume the volumes are additive. (a) 52.3 mL of water is added to 27.1 mL of 0.124 M KOH solution (b) 110. mL of water is added to 54.2 mL of 0.808 M NaCl solution ((please show work, thank u so much)
Wednesday, November 10, 2010 at 3:35am by Jasmin

chemistry
Convert 2.40 g Cu to moles. moles = grams/molar mass Using the coefficients in the balanced equation, convert moles Cu to moles HNO3. Molarity = moles/L. YOu know moles HNO3 and M HNO3, calculate L.
Wednesday, April 28, 2010 at 12:35pm by DrBob222

Chemistry
Write the equation. AgNO3 ==> AgCl (obviously 1 mol AgNO3 is need to form 1 mole AgCl). 0.657 g AgCl is how many moles? moles = g/molar mass = ?? moles AgCl = moles AgNO3. Molarity = moles/L. You know molarity and moles, solve for L.
Saturday, June 12, 2010 at 5:55pm by DrBob222

Chemistry
Suppose we have a solution of lead nitrate, Pb(NO3). A solution of NaCl(aq) is added slowly until no further precipitation occurs. The precipitate is collected by filtration, dried and weighed. A total of 10.27g of PbCl2(s) is obtained from 200.0mL of the original solution. ...
Wednesday, April 17, 2013 at 10:14am by Katherine

AP CHEM
1. Write the equation and balance it. 2. Calculate mols titrant added. mols = L x M 3. Convert mols titrant to mols unknown. You do this conversion with the coefficients in the balanced equation. Just the same as dimensional analysis. 4. Convert mols unknown to Molarity from ...
Thursday, July 31, 2008 at 10:31am by DrBob222

Chem II
Which of the follwoing gives the molarity of 17.0% by mass solution of sodium acetate (molar mass = 82.0 g/mol) in water. The density of the solution is 1.09 g/mL. OK - I know that to figure molarity is moles divided by liters. This is confusing me because it is "17.0% by mass...
Wednesday, June 4, 2008 at 12:13pm by Ken

Chemistry
Can someone please check to see if I am doing this correctly. Thank you :) Q) Calculate the new molarity of a 35mL sample of 0.450 M CaCl2 solution that is diluted with enough water to make 250 mL of solution. A) 0.450 m CaCl2 x 35mL/250mL = 0.063 mL diluted solution
Monday, April 1, 2013 at 5:21pm by Kishwa

college chemistry - molarity question
My textbook doesn't show me how to do problems like the following, and I'm having a hard time finding similar problems online. Most of the molarity problems I'm finding involve mixing a substance with water, but these involve mixing moles of substances with moles of other ...
Wednesday, April 29, 2009 at 1:23am by lholmq

Chemistry
I would start by converting 25 mL NO gas to moles with PV = nRT. Do the same for 22 mL O2. Using the coefficients in the balanced equation, convert moles NO and moles O2 (in two separate operations) to moles HNO3. From the hint, I expect the moles HNO3 from each will NOT be ...
Wednesday, March 31, 2010 at 11:57pm by DrBob222

Chemistry
I think the easiest way to solve this problem is to a)determine molarity of the HCl solution. b) apply the dilution formula. a) 1.18g/mL x 1000 mL = mass of 1 L HCl soln. How much is HCl? That will be mass of 1L x 0.36 = ?? g HCl How many moles is that. That will be grams HCl/...
Tuesday, June 7, 2011 at 6:32pm by DrBob222

Chemistry
A. Standardization of Na2S2O3 -Mass of KIO3 in 100mL = 0.09600g -Calculate Molarity of KIO3= ? Please check: 0.09600g/(214.0g/mol)=4.486x 10^-4 mol -4.486 mol/0.1L= 0.004486 M This looks ok to me except for the -4.486. I don't know why the - sign is there unless it's just a ...
Sunday, March 6, 2011 at 11:42pm by DrBob222

Chemistry
Household vinegar is aquous, 5% acetic acid HC2H3O2 solution by mass. The molarity is: 5% = 5g 1mol HC2H3O2 = 60.05g HC2H3O2 5g/60.05g = 0.08326394671 mol therefore the molarity is 0.08326394671 mol/0.01L = 0.84mol/L
Sunday, April 10, 2011 at 10:26pm by Ntswaki Ramalobela

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